package com.cqrd.five.util;

import com.google.gson.Gson;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.Jedis;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

public class PhoneCode {
    private String randString = "0123456789";
    private int width = 95;
    // 图片宽
    private int height = 25;
    // 图片高
    private int lineSize = 40;
    // 干扰线数量
    private int stringNum = 4;
    // 随机产生字符数量
    private static final Logger logger = LoggerFactory.getLogger(PhoneCode.class);
    private Random random = new Random();
    /**
     *  * 获得字体
     *  */
    private Font getFont() {
        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
    }
    /**
     *  * 获得颜色
     *  */
    private Color getRandColor(int fc, int bc) {
        if (fc > 255) {
            fc = 255;
        }
        if (bc > 255) {
            bc = 255;
        }
        int r = fc + random.nextInt(bc - fc - 16);
        int g = fc + random.nextInt(bc - fc - 14);
        int b = fc + random.nextInt(bc - fc - 18);
        return new Color(r, g, b);     }
        /**
         *  * 生成随机图片
         *  */
        public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
            // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
            Graphics g = image.getGraphics();
            // 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
            g.fillRect(0, 0, width, height);
            //图片大小
            g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
            //字体大小
            g.setColor(getRandColor(110, 133));
            //字体颜色
            // 绘制干扰线
            for (int i = 0; i <= lineSize; i++) {
                drowLine(g);
            }
            // 绘制随机字符
            String randomString = "";
            for (int i = 1; i <= stringNum; i++) {
                randomString = drowString(g, randomString, i);
            }
            //将生成的随机字符串保存到缓存中
            Jedis jedis = JedisPoolUtils.getJedis();
            Gson gson = new Gson();
            String categorylist = MD5Util.MD5EncodeUtf8(randomString);
            String categorylistJson= gson.toJson(categorylist);
            jedis.set("codelistJson", categorylistJson);
            //设置过期时间
            Date outdate = new Date(System.currentTimeMillis() + 1 * 60 * 1000);//1分钟后过期
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String stringoutdate = sdf.format(outdate);
            jedis.set("datelistJson", stringoutdate);
            g.dispose();
            try {
                // 将内存中的图片通过流动形式输出到客户端
                ImageIO.write(image, "JPEG", response.getOutputStream());
            } catch (Exception e) {
                logger.error("将内存中的图片通过流动形式输出到客户端失败", e);
            }
        }
        /**
         *  * 绘制字符串
         *  */
        private String drowString(Graphics g, String randomString, int i) {
            g.setFont(getFont());
            g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121)));
            String rand = String.valueOf(getRandomString(random.nextInt(randString.length())));
            randomString += rand;
            g.translate(random.nextInt(3), random.nextInt(3));
            g.drawString(rand, 13 * i, 16);
            return randomString;
        }
        /**
         *  * 绘制干扰线
         *  */
        private void drowLine(Graphics g) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(13);
            int yl = random.nextInt(15);
            g.drawLine(x, y, x + xl, y + yl);
        }
        /**
         *  * 获取随机的字符
         *  */
        public String getRandomString(int num) {
            return String.valueOf(randString.charAt(num));
        } }